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Mention different mmap(2) behaviour with retain:true.

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Edward Tomasz Napierala 2018-11-30 13:57:49 +00:00 committed by David Goldblatt
parent 522d1e7b4b
commit a7b0a124c3
1 changed files with 3 additions and 0 deletions
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doc/jemalloc.xml.in
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@ -944,6 +944,9 @@ mallctl("arena." STRINGIFY(MALLCTL_ARENAS_ALL) ".decay",
<citerefentry><refentrytitle>munmap</refentrytitle> <citerefentry><refentrytitle>munmap</refentrytitle>
<manvolnum>2</manvolnum></citerefentry> or equivalent (see <link <manvolnum>2</manvolnum></citerefentry> or equivalent (see <link
linkend="stats.retained">stats.retained</link> for related details). linkend="stats.retained">stats.retained</link> for related details).
It also makes jemalloc use <citerefentry>
<refentrytitle>mmap</refentrytitle><manvolnum>2</manvolnum>
</citerefentry> in a more greedy way, mapping larger chunks in one go.
This option is disabled by default unless discarding virtual memory is This option is disabled by default unless discarding virtual memory is
known to trigger known to trigger
platform-specific performance problems, e.g. for [64-bit] Linux, which platform-specific performance problems, e.g. for [64-bit] Linux, which